Would really appreciate some advice on faulty wall socket in loft

[TommyTee]

I have a double wall socket in the loft that isn't working, its directly above the control panel and switch for the underfloor heating in the bathroom on the floor below. It doesnt work whether this is switched on or off.

When inspected the socket I noticed it looked like the black wire on the left may be loose (I've attached some pictures), could that be what is causing it not to work?

Would really appreciate some advice from someone more knowledgable than me?

Thanks in advance
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The pictures didnt upload so here the links to them

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Image 20200510-124937 hosted in ImgBB

ibb.co

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Image 20200510-124926 hosted in ImgBB

ibb.co

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Image 20200510-124920 hosted in ImgBB

ibb.co

20200510-124943 hosted at ImgBB

Image 20200510-124943 hosted in ImgBB

ibb.co

20200510-124843 hosted at ImgBB

Image 20200510-124843 hosted in ImgBB

ibb.co

 

[westward10]

They look like a pair of 6.0 T&E cables which are pretty large to fit into a 13A socket outlet. It is possible one isn't making contact but if you can't pull it out it is probably okay, the bare earth wires also require green/yellow sleeving. Do you know where else it goes because that isn't end of circuit.